基于点阵投影的彩色复合光栅傅里叶变换轮廓术  

Fourier Transform Profilometry of Colorful Composite Grating Based on Point Array Projection

作　　者：宋雷[1] 岳慧敏[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054

出　　处：《光学学报》2010年第5期1368-1373,共6页Acta Optica Sinica

基　　金：校青年基金(JX0739)资助课题

摘　　要：传统傅里叶变换轮廓术(FTP)采用单一频率条纹测量时存在着由于待测物体高度变化剧烈导致的相位展开困难。结合数字点阵和正弦条纹投影的复合编码三维数字成像方法能有效解决相位模糊和误差传播的问题,但在实际测量中需要分别采集点阵图像和正弦条纹图像,影响了测量的实时性。提出一种新型彩色复合光栅测量方法,实现了从一帧图像中分别得到点阵图像和正弦条纹图像,并以点阵图像为依据对正弦条纹图的截断相位进行展开。理论分析和实验结果表明,该方法适合于不连续物体的三维测量,同时抑制误差传播能力强,具有较高的测量效率。Difficulties of phase unwrapping caused by the intense height discontinuity of the tested object exist in the traditional Fourier transform profilometry（FTP） when the single frequency sinusoidal fringe pattern is projected.The hybrid encoding method based on digital point array and sinusoidal fringe pattern projection can solve the problem of the phase ambiguity and error propagation effectively.But a point array pattern and a sinusoidal fringe pattern are demanded to be projected respectively,and it can seriously reduce the measuring efficiency.A new method of colorful composite grating is proposed.It is possible to get a point array pattern and a sinusoidal fringe pattern from only one frame of image.The wrapped phase can be exactly unwrapped according to the point array pattern.Theoretical analysis and experimental results show that the proposed method can be used to solve the profilometry of objects surface with large height discontinuities.Besides that,the novel method has a strong capability of anti-error-propagation and high efficiency in the measurement.

关 键 词：信息光学 相位展开 彩色复合光栅 傅里叶变换轮廓术 色度 

分 类 号：TN206[电子电信—物理电子学]